Flashing the wrong firmware can "brick" your TV's mainboard. Ensure your board number ( MS638 ) and panel model match exactly before attempting to install. Do you have the other parts of this archive already, or
Since direct links to firmware parts are frequently taken down, I recommend checking these reputable technician hubs: : Search for the "MS638 PC822" chassis. Download MS638 PC822 3840x2160 REF55 part4 rar
Finding specific firmware "parts" like this usually points to a few scenarios common in the TV repair community: Flashing the wrong firmware can "brick" your TV's mainboard
: A common repository for Skyworth/Coocaa 4K firmware. Finding specific firmware "parts" like this usually points
: High-resolution (4K/3840x2160) firmware files are often 1GB to 2GB. To bypass upload limits on free hosting sites, technicians split them into multiple .rar parts. You need all parts (Part 1, 2, 3, and 4) in the same folder to extract the final .pkg or .bin file.